Mine is.. me. Surprise! My comrade and I were exploring an abandoned/derelict/whatever wing of a hospital-turned-nursing home. This building was totally fucked, missing windows, decay everywhere, etc. But it was connected to the main building at the end of the hallway. On one side, we had piles of paint chips and whatever crap had blown/washed in and on the other side of this door the floors were polished and the lights were on. I really like that sort of vibe such juxtapositions give off. We're the goons on the dirty side of the window watching you shuffle down the clean hallways... Anyway, we proceed to the basement and find that it, too, connects to the main facility and it's wide open. Lights on, generators buzzing, voices in the distance. I was stopped at the bottom of the stairs listening and waiting to proceed further when unbeknownst to me, my comrade had taken this. We eventually proceeded through a good portion of the basement before turning back due to approaching footsteps. I had always thought about going back and doing a staged version that wasn't blurry and imperfect, but I never got around to it.